We would like, in this trip of ours among the energies, to give emphasis to a particular form of energy that, beginning from the 18th century, up to our days, it has changed without any doubt the evolution of our society, electromagnetic energy.

   The origin of this knowledge makes him go up again to a Scottish physicist James Clark Maxwell (1831 - 1879) that it analytically foretold the existence of it also founding on the studies of Faraday (1791 - 1867). It was then the German physicist Heinrich Hertz (1857 - 1894) that with his experiments of interference it tried the existence of it beyond every reasonable doubt.
And it is important to know that these experiments were conducted in the portion of the electro-magnetic spectrum related to the radio waves: this fact, thanks to the undisputed genius of Gugliemo Marconi, said beginning to the development of the radio communications.
Returning to the experiments of Hertz, they were put in evidence some properties of the radio waves as the reflection, refraction and polarization analogous to those revealed by light.
Concluded an amazing fact: the light is nothing more than an electromagnetic wave.

1 CHARACTERISTICS OF ELECTROMAGNETIC WAVES 

1.1 SPEED

1.2 WAVELENGTH 

1.3 FREQUENCY

1.4 AMPLITUDE

1.5 INTENSITY

2 ELECTROMAGNETIC SPECTRUM 

3 RADIO WAVES

3.1 TRANSMISSION OF THE INFORMATON

3.2 PROPAGATION OF THE RADIO WAVES

   We conclude this brief trip among electro-magnetic waves with a normative picture on the exposures of the human body to the electromagnetic fields, in use in the different countries of the world.